Transfers
| Date | From | To | Type |
|---|---|---|---|
| 22.05.2018 | Twente | — | — |
| 25.01.2017 | — | Twente | Free |
| 01.12.2011 | Celtic | Southampton | 620K € |
| 31.08.2011 | Celtic | Southampton | Loan |
| 18.01.2011 | Celtic | FC Copenhagen | Loan |
| 01.01.2010 | — | Celtic | 2.2M € |
| 01.07.2006 | Heerenveen | — | Free |
| 01.07.2004 | Heerenveen | PEC Zwolle | Loan |